Quasi-bound states in the continuum for electromagnetic induced transparency and strong excitonic coupling
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Advancing on previous reports, we utilize quasi-bound states in the continuum (q-BICs) supported by a metasurface of TiO2 meta-atoms with broken inversion symmetry on an SiO2 substrate, for two possible applications. Firstly, we demonstrate that by tuning the metasurface's asymmetric parameter, a spectral overlap between a broad q-BIC and a narrow magnetic dipole resonance is achieved, yielding an electromagnetic induced transparency analogue with a 50 μs group delay. Secondly, we have found that, due to the strong coupling between the q-BIC and WS2 exciton at room temperature and normal incidence, by integrating a single layer of WS2 to the metasurface, a 37.9 meV Rabi splitting in the absorption spectrum with 50% absorption efficiency is obtained. These findings promise feasible two-port devices for visible range slow-light characteristics or nanoscale excitonic coupling.
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Hajian, Hodjat; Zhang, Xia; McCormack, Oisín; ZHANG, YONGLIANG; DOBIE, JACK; Rukhlenko, Ivan; et al. (2024). Quasi-bound states in the continuum for electromagnetic induced transparency and strong excitonic coupling. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.7207446.v1